Merge pull request #2199 from acqn/FAMFix

[cc65] Forbidden struct itself with flexible array member as struct member or array element

test/err/bug2016-fam-member.c

@@ -0,0 +1,11 @@
+/* Bug #2016 - cc65 erroneously allows struct fields that are structs with flexible array members */
+
+typedef struct x {
+    int a;
+    int b[];    /* Ok: Flexible array member can be last */
+} x;
+
+struct y {
+    x   x;      /* Not ok: Contains flexible array member */
+    int a;
+};

test/err/bug2017-fam-element.c

@@ -0,0 +1,9 @@
+/* Bug #2017 - cc65 erroneously allows arrays of structs with flexible array members */
+
+struct z {
+    int a;
+    int c;
+    int b[];
+};
+
+struct z y[3];          /* Should be an error */